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CHAPTER 15: Remote Connectivity
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platform and likewise manage any platform, provided the client has a VNC server running. Other operating systems can connect using a standard VNC client, allowing you to quickly tap into another computer, no matter what kind of machine you re connecting from. This is obviously a dangerous aspect of VNC, as an attacker can compromise your system by remotely accessing it if the VNC client is not secured properly. If you do not want to allow other systems to connect to yours, then we recommend disabling this feature entirely (it is not enabled by default). If you would, however, like to allow other systems to be able to connect to yours, there is a way to set this up securely. Let s walk through setting up screen sharing in a secure manner.
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Enabling Screen Sharing
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To enable Screen Sharing, open the Sharing preference pane. Then click either the Screen Sharing or Remote Management check box (see Figure 15 1). Checking Screen Sharing will allow for only remote control and observation. We ll discuss remote management shortly. Once you have started the Screen Sharing service you will be able to click on the Allow access for section, and set it to Only these users.
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Figure 15 1. Setting up Screen Sharing
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One of the most critical aspects of securing Screen Sharing is limiting which users are allowed to connect to your system remotely. The Allow access for section is where you would configure which users (from the Accounts pane in System Preferences) have access to share any of these services by clicking the plus (+) button. Select the user from the list in the dialog box (see Figure 15 2) that you would like to grant access to this preference, and then click the Select button.
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CHAPTER 15: Remote Connectivity
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Figure 15 2. Selecting users
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Once you have added the users to whom you would like to grant VNC client access, click the Computer Settings button in the Sharing preference pane, and verify that the Anyone may request permission to control screen is unchecked (see Figure 15 3). Leaving this option enabled means you will be prompted when clients attempt to gain access. In many cases, it is preferable to be prompted because it allows users to be informed when a remote connection is being made.
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Figure 15 3. Screen sharing computer settings
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If you know that users without ARD (such as Windows workstations or those using Chicken of the VNC) will need to control the machine with a different VNC client, click the VNC viewers may control screen with password box. Otherwise, leave it unchecked, because allowing any VNC access increases the susceptibility of a system. To control your computer, VNC clients on the local network can connect to it via IP address or Bonjour. As a Bonjour-enabled service, Screen Sharing is also available via Wide-Area Bonjour, courtesy of .Mac.
Implementing Back to My Mac
If you have a current .Mac account and you are using Mac OS X 10.5 or later, the Back to My Mac feature of .Mac allows you to connect to any computer that has your .Mac username and password entered in the .Mac pane of System Preferences. This eliminates the need to forward ports on your router, because it accesses the remote system using the .Mac system preference. Leopard s built-in Screen Sharing feature is used to allow both Back to My Mac and VNC to connect to your computer. You can
CHAPTER 15: Remote Connectivity
stop or start Back to My Mac using the Back to My Mac tab in the .Mac preference pane (see Figure 15 4).
Figure 15 4. Back to My Mac in the .Mac preference pane
Configuring Remote Management
Screen Sharing is great for home use, but ARD is far superior for larger environments with more requirements. If you only need remote control, then Screen Sharing will typically suffice. If you have large numbers of systems to manage, or you need the ability to remotely install software or send Unix commands, then Remote Management is likely going to be of more use to you. In the Sharing preference pane, the management features are referred to as Remote Management, and can be controlled granularly on a per-task basis. The Remote Desktop application, used to control Macs using ARD, is licensed separately. If you enable Remote Management, Screen Sharing will automatically be disabled. Remote Management includes the VNC access managed by Screen Sharing.
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